It's up to the authors of the layouts to provide such features. The case is currently that most people who write layouts don't really care about who uses their layout or not. Its a thing mostly intended for themselves and no-one else, which is why most (if not currently all) layouts hard-code the whole setup.

if thats the case than i honestly do not understand what all those layouts are doing flooding the download section of this site. just post and/or link them in the fora so ordinary users dont get bothered with them. again, there is some excellent work out there (mainly by you and zork imho) but the lack of a gui-setup kind of thing puts the whole ouf concept down.